// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "src/compiler/select-lowering.h"

#include "src/compiler/common-operator.h"
#include "src/compiler/diamond.h"
#include "src/compiler/graph.h"
#include "src/compiler/node.h"
#include "src/compiler/node-properties.h"

#include "src/objects-inl.h" // weolar

namespace v8 {
namespace internal {
    namespace compiler {

        SelectLowering::SelectLowering(Graph* graph, CommonOperatorBuilder* common)
            : common_(common)
            , graph_(graph)
        {
        }

        SelectLowering::~SelectLowering() = default;

        Reduction SelectLowering::Reduce(Node* node)
        {
            if (node->opcode() != IrOpcode::kSelect)
                return NoChange();
            SelectParameters const p = SelectParametersOf(node->op());

            Node* cond = node->InputAt(0);
            Node* vthen = node->InputAt(1);
            Node* velse = node->InputAt(2);

            // Create a diamond and a phi.
            Diamond d(graph(), common(), cond, p.hint());
            node->ReplaceInput(0, vthen);
            node->ReplaceInput(1, velse);
            node->ReplaceInput(2, d.merge);
            NodeProperties::ChangeOp(node, common()->Phi(p.representation(), 2));
            return Changed(node);
        }

    } // namespace compiler
} // namespace internal
} // namespace v8
